JPH06344023A - Extruded shape material of aluminium - Google Patents

Abstract

PURPOSE:To provide an extruded shape material of aluminum and aluminium alloy to improve the bendability or the shock resistant characteristic, etc., in a case of bending, especially, severe working. CONSTITUTION:In an extruded shape material of Al or Al alloy, the waviness is formed on a part or all the surface. Further, the extruded shape material is hollow and shapes having intermediate ribs, at least more than one piece, and the waviness is formed on the extruded surface or one side, at least of the intermediate ribs. The waviness is given by the method of changing the position or the size of the die chamber part for the extruded shape material, further the bearing length of angle, and also with the strain during cooling time of press working, bending, machining or water cooling of extrusion. Especially, it is effective for automobile parts (bumper, impact bar, frame, etc.) or construction members, etc., and further for parts which need the severe forming or parts which receive the impact, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum extruded material made of Al or an Al alloy, and particularly for automobile parts, building members, etc., when a strict molding is required or a member which receives an impact (bumper, impact bar, frame). Etc.) and the like for aluminum extruded mold materials.

[0002]

2. Description of the Related Art Conventionally, when Al and Al alloy extruded mold materials are applied in the molding of automobile parts, building members, etc., it is possible to deal with the desired molding by ordinary bending. When it is not possible and severe processing is required, it is unavoidable to carry out processing such as partial heating, which inevitably results in cost increase due to an increase in the number of processes.

Under such circumstances, from the viewpoint of environmental problems such as global warming and ozone layer destruction, weight reduction of automobiles has been seriously studied in order to suppress the increase of carbon gas in the atmosphere. ing.

Although there are various methods for reducing the weight, it has been studied to replace the material, that is, to use the aluminum extruded die material in place of the steel sheet which has been mainly used in the past, in order to reduce the weight. It is increasing.

However, the bending formability of the aluminum extrusion mold material is
Since it is inferior to steel sheets, there is a strong need for improvement in terms of materials and forming methods.

On the other hand, impact resistance is sometimes required when an aluminum extrusion mold material is applied to automobile parts and the like as automobiles are made lighter, and a large buckling or cracking occurs in the impact test for that purpose. There was a limit to the cross-sectional design due to a decrease in energy absorption. In addition, the cost has been unavoidable by making holes and notches in the extruded mold material.

As described above, the impact characteristics of the extruded aluminum material
Since (mainly energy absorption) is inferior to the press-formed product of steel sheet, there is a strong need for improvement in terms of material / section design and manufacturing method.

The present invention has been made in order to meet such a demand, and Al and Al which can improve the bending workability, especially the bending workability in the case of severe working, or the impact characteristics.
It is intended to provide an alloy extruded mold material.

[0009]

In order to solve the above-mentioned problems, the present inventor has conducted earnest research on a method capable of improving bending workability and impact characteristics of an aluminum extrusion mold material, and as a result, the surface or the middle of the extrusion mold material By suppressing the state of the ribs,
It has been found that the above-mentioned request can be met.

That is, the gist of the present invention is an aluminum extrusion mold material which is characterized in that an undulation is formed on the surface of the extrusion mold material made of Al or Al alloy.

Another aspect of the present invention is an extrusion mold material made of Al or an Al alloy, which is hollow and has at least 1
The gist of the aluminum extrusion mold material is a shape including the above-described middle rib, and the undulation is formed on at least one of the extrusion surface and the middle rib.

[0012]

The present invention will be described in more detail below.

The present invention can be applied to aluminum extruded mold materials having various component systems and compositions and shapes / structures, and it is important to form undulations on the surface or inside ribs. Examples of the shape and structure of the extruded aluminum material include a solid shape, a pipe shape, a hollow shape having a middle rib, and the like.

Conventionally, the surface or middle rib of an aluminum extrusion mold material is generally a smooth surface, and when it is used for automobile parts in this state, as described above, the bending workability is poor, or the impact property is poor. Was becoming.

On the other hand, in the present invention, as a result of research based on a completely original idea of positively imparting non-smoothness to the surface or the middle rib of the aluminum extrusion mold material, as a result, the surface or the middle rib is undulated. It was found that bending workability and impact characteristics can be remarkably improved by forcibly forming.

The reason for this is not clear, but first, in bending, it is thought that by processing the undulating surface toward the side receiving the tension during bending, tensile stress is absorbed and cracking does not occur. (See FIG. 8).

In the case of bending, the undulating surface is
There may be any number of parts that are subjected to tensile stress during bending, such as a mode where undulations are formed only on the surface that receives tension during bending, or undulations only on the part that is subjected to bending during bending. It is possible to form various undulations, such as a mode of forming the undulation.

Further, when it is used for a part that receives an impact, and the undulating surface is on the side that receives the impact directly (in the vertical direction) (bumper, impact bar, building member, etc.),
Absorption of impact load due to undulation can prevent cracking, and when the undulation surface is opposite to the surface directly (vertically) receiving an impact (bumper, impact bar,
(Building members, etc.), the undulating surface receives tensile force at the time of impact,
It is considered that cracking can be prevented by extending the swell (see Fig. 9). If the undulating surface is formed in the same direction as the impact direction (frame, etc.), the area receiving the load is increased due to the undulation, which delays buckling due to impact and is one of the causes of reduced energy absorption. It is considered that the buckling can be prevented (see FIG. 10). In any case, it is effective to form the waviness in the middle rib and / or the web portion, and there may be any number of wavy surfaces depending on the intended energy absorption amount.

Regarding the size of the swell, various heights,
The pitch can be set, and it may be determined according to the purpose of use. Generally, the height is about 1 to 30 mm, and the pitch is 10
About 300 mm is used as a guide, and the height and pitch are appropriately selected according to the size of the undulation. For example, a small pitch and a high waviness are more excellent in impact characteristics, but increase the weight of the extrusion mold material. For bending, a relatively large pitch is preferable.

As a method for imparting undulations to the surface or the middle rib of the aluminum extrusion mold material, there may be mentioned a method of changing the position and size of the die chamber part for extrusion mold material or the bearing length and angle. It can also be applied by pressing, bending, machining, or distortion during cooling by extrusion water cooling. A swell formed by forcibly forming a large strain is desirable.

Next, examples of the present invention will be described.

[0022]

[Example 1]

An aluminum alloy ingot (diameter 155 mm) of JIS 7003 composition was melted by a usual method. next,
The ingot was homogenized at a temperature of 475 ° C. for 8 hours. Then, the ingot was air-cooled with an extrusion fan under the conditions of an extrusion temperature of 500 ° C. and an extrusion speed of 5 m / min to obtain a square pipe having an outer diameter of 40 mm and a wall thickness of 1.8 mm.

As the extrusion mold material, undulation was generated on one of the four surfaces, and one having a large undulation and one having a small undulation were prepared depending on the bearing length and extrusion conditions. Large waviness has a bearing length of 2 mm on the surface generating waviness, a pitch interval of 100 mm and a height of 4 mm. Small waviness has a bearing length of 1 mm and a pitch interval of 50 m.
m and height is 4 mm (see Fig. 1). In addition, as a comparative material, a material having four sides and no waviness was manufactured. The square pipe was cut into a predetermined length, held at a temperature of 70 ° C. for 5 hours, and then held at a temperature of 170 ° C. for 6 hours to obtain a test material.

Next, the test method will be described. The test method is a bending test (bending angle: 90
And bending radius: 100 Ri, 80 Ri). This tester has a structure in which a cored bar is inserted into one end of an extrusion mold material (square pipe), pressed by a pressure mold and a wiper, and the other end is clamped by a clamp mold and bent along a bending mold.

The formability was evaluated by the limit bending radius. The results are as shown in Table 1, and it was confirmed that the examples of the present invention were improved in the critical bending radius as compared with the comparative examples.

[0027]

[Table 1]

[0028]

Example 2

An aluminum alloy ingot (diameter 155 mm) of JIS 7003 composition was melted by a usual method. next,
The ingot was homogenized at a temperature of 475 ° C. for 8 hours. After that, the extrusion temperature is 500 ° C and the extrusion speed is 10 m /
The ingot was air-cooled with an extrusion fan under the condition of minutes to obtain a square pipe having an outer diameter of 40 mm and a wall thickness of 1.8 mm.

The extruded mold material generates undulations on two of the four surfaces facing each other, and depending on the bearing length and extrusion conditions,
One with a large swell and one with a small swell were prepared. Large waviness has a bearing length of 2 mm on the surface generating waviness and a pitch interval of 30 mm and a height of 4 mm. Small waviness has a bearing length of 1 mm and a pitch interval of 20 mm and a height of 4 mm. Yes (see Figure 3). In addition, as a comparative material, a material having four sides and no waviness was manufactured. The square pipe was cut into a predetermined length, held at a temperature of 70 ° C. for 5 hours, and then held at a temperature of 170 ° C. for 6 hours to obtain a test material.

Next, the test method will be described. As the test method, a compression tester shown in FIG. 4 was used and tested at a speed of 30 mm / min. The energy absorption was evaluated by taking a load and a displacement diagram in the compression test and measuring the energy absorption by the area.

The results are as shown in Table 2, and it was confirmed that the examples of the present invention were improved in energy absorbability as compared with the comparative examples.

[0033]

[Table 2]

[0034]

Example 3

An aluminum alloy ingot of JIS6061 composition was melted by a usual method. Next, this ingot was homogenized at a temperature of 540 ° C. for 4 hours. Then, the ingot was extruded and water-cooled under the conditions of an extrusion temperature of 510 ° C. and an extrusion rate of 6 m / min to obtain an extruded mold material having the shape and dimensions shown in FIG.

At this time, undulations were generated in the ribs in the middle of the extrusion die material according to the position and size of the die chamber for the extrusion die material, and the pitch and height were changed according to the extrusion conditions (FIG. 6). reference). High swell was obtained at a small pitch by increasing the extrusion speed. As a comparative material, a swell-free material was also manufactured. Then, the extruded shape material was cut into a predetermined length and kept at a temperature of 170 ° C. for 8 hours to obtain a test material. Table 3 shows the pitch, height and weight of the test materials.

Next, the test method will be described. The test method was a test using a compression tester shown in FIG. 7 at a speed of 50 mm / min.
Energy absorption was evaluated by taking a load and displacement diagram in a compression test and measuring the amount of energy absorption by the area. As a result, as shown in Table 4, the examples of the present invention are
Compared to the comparative example, a remarkable improvement in energy absorption was recognized and the impact characteristics were excellent.

[0038]

[Table 3]

[0039]

[Table 4]

[0040]

As described in detail above, according to the present invention,
Since it has excellent bending workability, it is possible to use Al and Al alloy extruded mold materials for various molded products that are difficult to process.
Since it has excellent impact properties, it can be used in various molded products that have been buckled during impact, and the impact properties can be made thinner to reduce the thickness of the product. is there.

[Brief description of drawings]

1A and 1B are explanatory diagrams showing types of undulations in Example 1, where (A) shows a case without undulations, (B) shows a case with large undulations, and (C) shows a case with small undulations.

FIG. 2 is an explanatory diagram showing an outline of a bending tester and a test procedure.

3A and 3B are explanatory diagrams showing types of undulations in Example 2. FIG. 3A is a case without undulations, FIG. 3B is a case with large undulations, and FIG. 3C is a case with small undulations.

FIG. 4 is an explanatory diagram showing an outline of a compression tester and a test procedure.

FIG. 5 is a diagram showing the shape and dimensions of the extrusion mold material manufactured in Example 3;

6A and 6B are diagrams illustrating undulations in Example 3. FIG.

FIG. 7 is an explanatory diagram showing a procedure of a compression test.

FIG. 8 is a diagram illustrating a case where an extrusion mold material is subjected to bending.

FIG. 9 is a diagram illustrating a case where the extruded mold material is used for a part that receives an impact.

FIG. 10 is a diagram illustrating another example in which the extruded mold material is used as a component that receives an impact.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshinori Yasuda No. 14 No. 1 Chofu Minatomachi, Shimonoseki City, Yamaguchi Prefecture Kobe Steel Co., Ltd. Company Kobe Steel Works Chofu Factory

Claims (15)

[Claims] 1. An extruded mold material made of Al or an Al alloy, wherein undulations are formed on the surface of the extruded mold material. 2. An extruded mold material made of Al or an Al alloy, which is hollow and has at least one or more middle ribs, wherein waviness is formed on at least one of the extruded surface and the middle rib. Aluminum extruded mold material characterized by 3. The aluminum extrusion mold material according to claim 1, wherein the waviness is formed on a part of the surface of the aluminum extrusion mold material. 4. The aluminum extrusion mold material according to claim 1, wherein the waviness is formed on the entire surface of the aluminum extrusion mold material. 5. The aluminum extrusion mold material according to claim 2, wherein the waviness is formed in a part of the middle rib. 6. The aluminum extrusion mold material according to claim 2, wherein the undulations are formed on the entire middle rib. 7. The aluminum extrusion mold material according to claim 1, wherein the height of the undulation is 1 to 30 mm and the pitch is 10 to 300 mm. 8. The aluminum extrusion mold material according to claim 1, wherein when there are a plurality of undulations, the undulations have the same height and pitch. 9. The aluminum extrusion mold material according to claim 1, wherein the undulations are undulations that are forcibly formed during extrusion processing. 10. A bumper for an automobile, which basically comprises the aluminum extruded mold material according to claim 1 or 2, wherein the extruded mold material having undulations formed in the longitudinal direction is arranged such that the longitudinal direction is perpendicular to the impact direction. A bumper for automobiles characterized by being arranged. 11. An impact bar for an automobile, which is basically composed of the extruded aluminum material according to claim 1 or 2.
An impact bar for an automobile, comprising: an extruded mold material having undulations formed in a longitudinal direction thereof so that the longitudinal direction thereof is perpendicular to the impact direction. 12. A building member based on the aluminum extruded mold material according to claim 1 or 2, wherein the extruded mold material having undulations in the longitudinal direction is arranged such that the longitudinal direction is perpendicular to the impact direction. A building member characterized by being used. 13. A frame for an automobile, which basically comprises the aluminum extruded mold material according to claim 1 or 2, wherein the extruded mold material having undulations in the longitudinal direction is arranged such that the longitudinal direction thereof is parallel to the impact direction. An automobile frame characterized by being arranged. 14. An aluminum processed material obtained by bending the aluminum extruded mold material according to claim 1 or 2, wherein the undulating surface is processed so as to face a side that receives tension during bending. Aluminum processed material. 15. An aluminum processed material obtained by bending the aluminum extruded mold material according to claim 1 or 2, wherein the waviness surface is formed only on a surface which receives a tensile force during bending and is bent. An aluminum processed material, characterized in that the undulating surface is processed so as to face a surface that receives tension during bending.